Our partners at Effective Solution created QSalesData - the integration you are looking for.
Having separate ACT! and Quickbooks databases can be a major source of inefficiency and redundant work. Take your business to the next level of efficiency. Link your ACT! and Quickbooks applications together to eliminate double-entry and make your ACT! users more productive.
QuickBooks Integration with ACT!
This video provides you an overview of the use and benefits of the ACT and QuickBooks Integration
This video provides you an overview of the use and benefits of the ACT and Sage 50 (Peachtree) integration: